King Engine Bearings MB5540AM0.5 Main Bearing Set Isuzu Oversize - 4XC1 4XE1 0.50mm

The King Engine Bearings MB5540AM0.5 is a complete main bearing set designed for Isuzu 4XC1, 4XC1-T, and 4XE1W engines. This set is manufactured to a +0.50mm oversize specification, making it the correct choice for engines with reground or worn crankshafts that have been machined to the 0.50mm undersize journal diameter.

King Engine Bearings produces this set using their Alecular-M (AM) bearing material — a bi-metal construction featuring a deep aluminum-tin-copper alloy layer bonded directly to a steel backing. This design delivers excellent embedability, conformability, and fatigue strength, allowing the bearing to absorb small contaminants and handle the demands of a rebuilt or high-mileage engine.

Key Features:

• Complete main bearing set for Isuzu 4XC1, 4XC1-T, and 4XE1W engines
• +0.50mm oversize — designed for cranks machined 0.50mm undersize
• Alecular-M (AM) bi-metal construction — aluminum-tin-copper alloy on steel backing
• Precision-ground to tight wall thickness tolerances for proper oil clearance
• Chamfered oil holes for improved lubrication flow to journals
• OEM-equivalent fitment for straightforward installation during engine rebuilds
• Manufactured by King Engine Bearings, a dedicated engine bearing specialist since 1960

King Engine Bearings is a world-class developer and manufacturer exclusively focused on engine bearings, offering an extensive range for automotive, light and heavy-duty truck, marine, and other internal combustion engine applications. Every King bearing is held to strict quality standards to ensure reliable, long-lasting performance.